Drop-hammer.



A. KOCH.

DROP HAMMER. APPLIOATION FILED JAN. 24,1911.

994,936, Ptented June 13,1911.-

ADOLF KOCH, or-REMsoHmD-vrsnINe-HAUsEN, GERMANY.

DROP-HAMMER] Specification of Letters Patent:

Application filed January 24, 1911. "seriarno. 604,467.

To all whom it may concern:

Be it known that I, AnoLr KooI-I, manufacturer, a subject of the King ofPrussia, residing at Losenbiichelerstrasse 10, Remscheid-Vieringhausen,Kingdom of Prussia, German Empire, have invented new and usefulImprovements in and Relating to Drop-Hammers, of which the following isa specification.

Drop hammers are known in which the hammer head or block is secured tothe end of a belt which passes over a belt pulley (lifting pulley)arranged above the hammer and is adapted to rotate continuously, thelifting of the hammer being produced by the frictional engagement of aloose cylindrical roller with the said pulley. So long as the engagementcontinues the hammer is lifted. Now it is very difficult to adjust themechanism so that the hammer will reach the desired height at the rightmoment itbeing hardly ever possible for the smith to do so as hisattention is necessarily mainly directed to the work. Even when aspecial workman is intrusted with the actuation of the pressure roll,great care and attention on his part is necessary.

Now in accordance with the present invention the cylindrical rollreferred to above is replaced by a cam-shaped roll, that is to say aroll in which the various portions of the periphery are not allequidistant from the axis the radii gradually decreasing from a certainmaximum. The result is thereby attained that the height to which thehammer can be lifted is in proportion to the amount by which the shafton which the pressure roll rotates freely is caused to approach thelifting pulley. The lift is therefore no longer dependent upon the timeduring which the belt is pressed against the cam pulley but upon theextent to which the pressure roll is caused to approach the cam pulley.The certainty of the operation of the hammer is thereby so muchincreased that in mostcases its operation need not be intrusted to aspecial workman as the smith himself is well able to attend thereto.

An embodiment of the invention is illustrated by way of example in theaccompanying drawing in which:

Figure 1 is a front elevation and Fig. 2 is a side elevation of a hammercomprising the novel lifting mechanism.

The belt- 6 is secured to the hammer a which moves vertically upward anddown- .ward between the guide pillars; it is carried over the liftingpulley c which rotates in the direction indicated by the arrow, its endbeing secured to the point of maximum radius of the cam (Z, theperiphery of which is somewhat greater than the maximum lift of thehammer. The said cam rotates loosely on a bolt 6 which is mounted on alever mechanism 70 rotatable on c, it is held away from the cam pulleyby a spring The lever is connected with theoperating handle or pedal hby means of a rod 9. By acting upon this operating handle or the likethe shaft of the pressure roll or cam d is caused to approach thelifting pulley, the hammer rises gradually and in exact correspondencewith the movement of the operating handle as the distance of theperiphcry of the pressure roll from its axis gradually decreases. Uponthe movement of the operating handle in the opposite direction thehammer will of course move downward to a corresponding extent. It istherefore possible to lift the hammer to any desired height withcertainty and to allow it to fall from this height either freely or tofall gradually.

When the hammer drops the pressure roll is returned by the belt into itsinitial position; a stop i prevents the cam from rotating retractivelyto an excessive extent. It is not absolutely necessary to secure thebelt to the pressure roll or cam but its end can be fixed at any othersuitable place; in this case, however, a spring or the like must beprovided for automatically returning the pressure roll-to its initialposition when the hammer drops.

I claim:

1.. A device of the character described,

Patented-June13, 1911.

comprising a pulley, a belt engaging the same, a hammer suspended fromthe belt, a cam in proximity to the pulley, and means for setting thecam against and away from the pulley.

2. A device of the character described, comprising a pulley, a beltengaging the same, a hammer suspended from the belt, a spring controlledlever mounted in proximity to the pulley, a cam pivoted to the lever, 10and means for actuating the lever.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing Witnesses.

' ADOLF KOCH. [L.S.] WVitnesses:

ALFRED HENKEL, WALTER VONNEGUT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, I). C.

